如何从datagridview加载图片框中的图像 [英] How to load image in picture box from datagridview

问题描述

我收到错误无法从System.String转换为System.Byte []代码如下：

I am getting error "Cannot convert from System.String to System.Byte[]" on below code:

private void dgvProduct_CellContentClick(object sender, DataGridViewCellEventArgs e)
       {

           byte[] imgbyte = (byte[])dgvProduct.CurrentRow.Cells[11].Value;
           GetPhoto(imgbyte);

       }

我的尝试：

What I have tried:

private void dgvProduct_CellContentClick(object sender, DataGridViewCellEventArgs e)
      {

          byte[] imgbyte = (byte[])dgvProduct.CurrentRow.Cells[11].Value;
          GetPhoto(imgbyte);

      }

private void GetPhoto(byte[] imgbyte)
       {
           Image newImage;
           using (MemoryStream ms = new MemoryStream(imgbyte, 0, imgbyte.Length))
           {
               ms.Write(imgbyte, 0, imgbyte.Length);

               newImage = Image.FromStream(ms, true);
               pbItem.Image = newImage;

           }
       }

推荐答案

首先使用调试器并查看你试图转换的字符串究竟是什么：很可能它不是你可以直接用作图像数据的字节流：它可能是文件的路径，它可能是Base64翻译的图像数据，它可能完全是错误的单元格 - 我们不知道，现在你也不知道！



所以使用调试器看看凝视和锻炼实际上是什么内容：在行上放置一个断点

Start by using the debugger and looking at exactly what is in the string you are trying to convert: the chances are that it isn't a stream of bytes that you can directly use as image data: it may be a path to a file, it may be Base64 translated image data, it may be the wrong cell entirely - we don't know, and at the moment neither do you!

So use the debugger to look at the staring and work out what the content actually is: put a breakpoint on the line

byte[] imgbyte = (byte[])dgvProduct.CurrentRow.Cells[11].Value;

并检查单元格中的内容。



我们不能为您做到这一点 - 我们没有访问您的数据......

And examine what is in the cell.

We can't do that for you - we don't have any access to your data...

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